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Technical Information Materials - Aluminium

Chemical, physical and mechanical characteristics of Aluminium

Pure aluminium is a soft, ductile material, which limit its use and application. The addition of alloying elements (mainly magnesium, silicon, copper, zinc or manganese) increases its mechanical properties considerably, leading to its widespread use in areas where a good relation between strength and weight and a good corrosion resistance are required.

One of the most common alloys with excellent characteristics is Al7075 (commonly referred as Ergal), which includes, magnesium and copper, giving it the highest mechanical characteristic of aluminum alloys.

Aluminium alloys, when heat treated, obtain a higher tensile strength and increased mechanical properties, such as impact, weight and torsion resistance, and they become competitive with some steels , but with a volume density approximately three times lower.

The main characteristics of aluminium that allow its widespread use in many different areas are:

  • Lightness (about 1/3 compared to steel)
  • Excellent workability on machines and excellent quality of surface finish
  • Bright and aesthetically pleasing appearance
  • Good corrosion resistance
  • Good mechanical resistance

Al7075 is a light alloy which provides a high mechanical resistance as well as good vibration absorption, therefore it is used in a wide range of screws for aerospace and aeronautical applications, and also in the bicycle and motorcycle industries.

Screws/Bolts Washers
Designation P60 P65 P40 H14 Grade 3(h22)
ISO 209-2007 AlZn5.5MgCu AlZn5.5MgCu AlMgSi Al99,5 AlMg3
Grade 7075 7075 6060/6101 1050 5754
Heat Treatment ISO 2107:2004 T6 T73 T8 H14 H26
Manufacturing Process - - - Pressing Pressing
Tensile Strength N/mm2 550 490 270 260 200
Yield Strength N/mm2 460 420 240 210 280
Elongation after rupture min% 7 11 6 4 7
Hardness HB 160/185 146/169 95/105 72 63
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